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J/ApJ/661/250 Molecular line survey of CRL 618 (Pardo+, 2007)
Molecular line survey of CRL 618 from 80 to 276 GHz and complete model.
Pardo J.R., Cernicharo J., Goicoechea J.R., Guelin M., Asensio Ramos A.
<Astrophys. J., 661, 250-261 (2007)>
=2007ApJ...661..250PADC_Keywords: Stars, giant ; Radio lines ; Spectra, millimetric/submm
Keywords: circumstellar matter - line: identification - ISM: molecules -
radio lines: stars - stars: AGB and post-AGB - stars: carbon -
stars: individual (CRL 618) - surveys
Abstract:
We present the complete data set, model, and line identification of a
survey of the emission from the C-rich proto-planetary nebula CRL 618
performed with the IRAM 30m telescope in the frequency ranges
80.25-115.75GHz, 131.25-179.25GHz, and 204.25-275.250GHz. A selection
of lines from different species has been used in previous works to
derive the structure of the source, its physical conditions, and the
chemical abundances in the different gas regions. In this work, we
have used this information to run a global simulation of the spectrum
in order to check the consistency of the model and to ease the task of
line identification. The total number of lines that have a
correspondence in both data and model is ∼3100, although quite often
in this object many lines blend into complex features, so that the
model, which takes into account line blending, is a key tool at this
stage of the analysis. Of all the lines that we have been able to
label, ∼55% of them belong to the different forms of HC3N, and ∼18% to
HC5N. The density of remaining unidentified features above the 3sigma
limit is only 1 per ∼2.1GHz (74 features), which is unprecedented in
the analysis of this type of large millimeter-wave line surveys.
Description:
The CRL 618 IRAM 30m line survey was completed in 1994-2002.
Objects:
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RA (2000) DE Designation(s)
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04 42 53.6 +36 06 53 CRL 618 = RAFGL 618
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File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file
tables.dat 82 3164 Identified features in the 80.3-276.0GHz range
in the CRL 618 millimeter wave survey
(tables 4-6 of the paper)
See also:
Byte-by-byte Description of file: tables.dat
Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1- 11 F11.4 MHz Freq Frequency
13- 41 A29 --- Molecule Molecule identification
43- 82 A40 --- Transition The transition/v-state
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 21-Mar-2009